Explosive cartridge



EXPLOSIVE CARTRIDGE Filed July 23, 1924 ATTORNEY Patented June 30, 1925.

GEORGE B. HOLDER/ER, OF NEW ROCHELLE, NEW YORK, ASSIGNOR TO AIR REDUCTION COMPANY, INCORPORATED, 015 NEW YORK, N. Y., A CORPORATION OF NEW YORK.

nxrnosrvn CARTRIDGE.

Application filed July 23, 1924. Serial No. 727,652.

To all'wkomz't may concern:

Be it known that I, GEORGE B. HOLDERER, a citizen of the United States, residing at New Rochelle, in the county of Westchester, State of New York, have invented certain new and useful Improvements in Explosive Cartridges; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as w ll enable others skilled in the art to whlch it appertains to make and use the same.

This invention relates to explosive cartridges, and particularly to a type of cartridge, containing a non-explosive material of a carbonaceous nature, which is adapted to be saturated with liquid oxygen before insertion in the cavity in which it is to be exploded. Such cartridges have been suggested heretofore and numerous attempts have been made to employ them for com- .mercial purposes. The cartndges hereto fore used have been unsatisfactory because of the impossibility'of properly loading the cavities. Such cartridges have been onclosed in paper wrappers. At the low temperatures accompanying the use of liquid.

, oxygen, paper becomes brittle and if the cartridge is tamped in the cavity the wrapper bursts and the explosive is scattered in the numerous crevices existing in the rock or other material to be shattered. Portions of the carbonaceous material may be thrown from the cavity in an unburned condition forming dangerous powder trains which.

may cause premature explosions. If, on the other hand, the cartridge is not tamped it does not fillthe cavity completely and the air spaces surrounding the cartridge materially reduce the eifectiveness of the explosion. This is particularly true where the required drilling must be done in stages, the hole being 'reduced in diameter in the lower portions. With a cartridge of uniform diameter it is apparent that such .a hole cannot be filled properly. In either case the eifectiveness of the ex losion is not suflicient to warrent the su stitution of liquid oxygen cartridge for other explosives in commercial operations on a large scale.

v It is the object of the presentinvention to provide a cartridge of the character described havin numerous advantages and capable of satisfactory and eflicient use in competition with other explosives. p

Further objects and advantages of the in.- vention Wlll be apparent as it is better understood by reference to the following specification and accompanying drawing, in p showing the peculiar construction of the car tridge casing. a

In carrying out the invention I may use any suitable carbonaceous or other combustible material, preferabl in finely divided form to facilitate the a rption of an adequate amount of liquid oxygen. Lamp black and carbon black are satisfactory materials for this purpose but others ma be substituted. In. addition to the car on- 'aceous material other substances may be added as fillers to improve or increase the explosive efl'ect of the cartridge or to reduce the cost thereof. employed in the body'of the cartridge are not a part of the present invention which pelates more especially to the wrapper there- This wrapper comprises two parts, one of which is adapted to firmly hold the carbonaceous material during shipment of the cartridge and until it is placed in .the cavity where it is to be exploded. The other part is designed particularly to permit expansion of the cartridge in the cavity without loss of any of the material therein contained. The inner wrapper is preferably made of paper which is frangible, particularly at low temperatures. A cheap quality of paper may be used for this purposeso .long as it is sufliciently strong to withstand handling when reinforced by the outer wrapper. This wrapper is preferably made of a closely woven textile material which will prevent the escape of the carbonaceous-material The particular materials and is formed with longitudinal pleats per-' mitting the cartridge to be collapsed lengthwise and thus to expand so that it will concoating or lmpregnation ofany suitable material which will permit liquid oxygen to pass therethrough but which will exclude water. In this way the cartridge may be rendered impervious to water in the cavity. Linseed oil is a suitable material for application to the textile wrapper for the purposg specified but other substances maybe use The cartridge is manufactured preferably by forming a tube of paper and filling the tube with the carbonaceous material or composition. Theends of the paper tubes may be folded to retain the material therein.

The paper tube is then inserted in the tex-' tile wrapper, the ends of which are secured by tying or in any other suitable way This textile wrapper is of somewhat larger diameter than the paper wrapper and the surtent is released. The explosive composition.

-' expands into the textile wrapper WlllCh prevents escape thereof while permittingffiever theless the complete filling of the cavity. Where the cavity is large a number of cartridges can be inserted and tamped in place until the filling is complete. The cartridge is fired by the insertion of the usual detonator in the head thereof. The detonator can be exploded by means of a fuse or electricall as desired.

Referrin to the rawing, 5 indicates the wrapper 0 paper or equivalent material, which is capable of accomplishingthe desired result, enclosing the carbonaceous material 6 and holding 1t firmly in shape. The wrapper 5 is folded at 7 to retain the material therein. The ca-tridge thus formed is inserted in the outer wrapper 8 of textile material which is drawn over the ends of the cartridge and tiedjor otherwise fastened at 9. As indicated the wrapper 8 is formed with a plurality of pleats 10 which permit expansion of the cartridge when it is tamped in the cavity, The wrapper 8 may be coated or impregnated with a water-repellent substance. Inv this form the car-- tridge is complete and ready for shipment to the point w ere it is to be used. At that int it is soaked in liquid oxygen and placed in the cavity before the oxygen has an opportunity to eva rate.

Among the partic ar advantages of the invention are the elimination of air space in the cavity and the increased amount of he paper wrapper beexplosive material which can be inserted in a cavit of given dimensions owing tothe possibi ity of expanding the cartridge, with a consequent increase in the break of from to 100 per cent, an increased quantity of liquid oxygen'absorbed because of absorptlve character of the textile wrapper and lengthened life of the cartridge after soak- I therefor of frangible material and an outer expansible wrapper adapted to hold the filling when the inner wrapper is broken and to conform to the sha e ofthe cavity in whichthecartridge is p aced.

2. In an explosive cartridge a filling of carbonaceous material, an inner wrapper of frangible material and an outer wrapper adapted to hold the filling when the inner I wrapper is broken, said outer wrapper having longitudinal pleats permitting the cartridge to ex and and to conform thus to the shape o the cavity in which the cartridge is placed.

3. In an explosive cartridge a filling of carbonaceous material, an inner wrapper of paper and an outer expansible wrapper adapted to hold the filling when the inner wrapper is'broken and to conform to the shape of thecavity in which the cartridge is p aced.

4. In an explosive cartridge a filling of carbonaceous material, an inner wrapper of paper and an outer expansible wrapperadapted to'hold. the filling when the inner wrapper is broken, said outer wrapper having longitudinal pleats permitting the cartridge to exand and to conform thus to the shape 0 the cavity'in which the cartridge is placed.

5. In anexplosive cartridge a filling of carbonaceous material, an inner wrapper of frangible material and an outer expansible wrap er of textile material.

6. 11 an explosive cartridge a filling of carbonaceousmaterial, an inner wrapper of frangible material and an outer e ansible wrapper of textile material, sai outer wrapper havin longitudinal pleatspermitting the cartri e'toexpand when the inner wrap er is broken.

7. an explosive cartridge a fi]ling of carbonaceous material, an inner wrapper of paper and an outer expansible wrapper of textile material.

8. an explosive cartridge a filling of 5 inner wrapper is broken.

9. In an explosive cartridge a filling of I carbonaceous material, an mner wrapper of paper and an outer expansible wrapper adapted to hold the filling when the inner 10 wrapper is broken and to conform to the shape ofthe cavity in which the cartridge is placed, said outer wrap er being impregnated with a water-repelient material.

10. In an explosive cartridge a filling of carbonaceous material, an inner wrapper of paper and an outer expansible wrapper of textile material, said textile material being pregnated with a water-repellent material.

In testimony whereof I aflix my signature.

GEORGE B. HOLDERER. 

